【摘要】 采用平均场理论下的横场 Ｉｓｉｎｇ模型，得到同时考虑Ωｓ≠Ω，Ｊｓ≠Ｊ情况下超薄铁电膜的居里温度表达式，进一步研究除发现存在临界表面层隧穿频率．Ωｓｃ外还发现由Ｊｓ／Ｊ＝ Ｃ所反映的临界值Ｃｓc更多还原

【Abstract】 The Curie temperature expressions of Ultra’- thin ferroelectric films are obtained by using the transverse field Ising model in the mean-field approximation theory under the condition Ωｓ ≠ Ω Js / J. By means of Curie temprerature expressions,the Curie temprerature as functions of n I as well as the values of Js and Ωs for the surface layer has been studied. Finally, the new information of surface effects displayed by the Curie temperature are oblained.更多还原